检测WebBrowser控件中的滚动到底部 [英] Detect scroll to bottom in WebBrowser control

问题描述

我正在创建一个Windows表单来接受公司的一些条款和条件。因此，条款和条件在Web上，并通过WebBrowser控件导航到WinForm。只有在将完整文档滚动到底部后才需要启用接受按钮。我正在搜索类似于VScrollBar控件中的ValueChanged事件（如下所述）或任何其他选项的事件。

I am creating a Windows Form to accept some terms and conditions for a company. So the terms and conditions are on the web and it is navigated to the WinForm through WebBrowser control. It is required to enable the Accept button only after the full document is scrolled to the bottom. I am searching for an Event similar to ValueChanged Event in VScrollBar control(mentioned below) or any other option.

private void vScrollBar1_ValueChanged(object sender, EventArgs e)
    {
        if (vScrollBar1.Value+9 == vScrollBar1.Maximum)
        {
            acceptBtn.Enabled = true;
        }
    }

推荐答案

你应该处理 onscroll 窗口对象事件并检查 scrollHeight - scrollTop 等于 clientHeight for documentElement 。为此：

You should handle onscroll event of window object and check if scrollHeight - scrollTop equals to clientHeight for documentElement. To do so:

private void webBrowser1_DocumentCompleted(object sender, 
    WebBrowserDocumentCompletedEventArgs e)
{
    this.webBrowser1.Document.Window.AttachEventHandler("onscroll", OnScroll);
}

void OnScroll(object sender, EventArgs e)
{
    var script =
    @"(function()
       {
           var e = document.documentElement;
           if (e.scrollHeight - e.scrollTop === e.clientHeight)
               return true;
           else
               return false;
       })();";
    var result = webBrowser1.Document.InvokeScript("eval", new object[] { script });
    if ((bool)result)
        MessageBox.Show("Scrolled to end!");
}

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